(MOV – Metal Oxide Varistor)

To protect the safety sensors and logic boards from electrical storms and power surges. Use before a lightning strike or power surge occurs. Will decrease that chances of power surge or lightning strike shorting the receiver logic board for Chamberlain Liftmaster machines. Wiring Instructions:

1. Attach MOV wires directly to motor unit terminals 2 & 3 (white & black) located on the receiver logic board. Note: Units with quick connect terminals, both bell wires must be twisted or connected together and reinserted using only one hole leaving the second hole for MOV wire.
2. Route green ground wire to the chassis top. Attach wire to chassis with the self threading screw, using the existing hold as illustrated. Note: Screw drive units with side access dor, attach to the chassis hanging brackets with hardware provided.

Note: – This product will not protect receiver logic board or safety sensors from nearby electric storms or lightning strikes, but from power surges caused by those elements.